The influence of L-α-alanine admixture, rejuvenation process, and electric field on the electrical conductivity of TGS crystals

Okaz, Ali M.; El-Osairy, M.; Kassem, M. E.; Hamed, A. E.

doi:10.1080/01411598908206853

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…This broadening in the phase transition can be attributed to the presence of an internal bias field which stabilizes the spontaneous polarization (Keve et al, 1971). The degree of stabilization of this spontaneous polarization increases with the increase of bias field, which is a function of the L-a alanine concentration (Okaz et al, 1988). This agrees with previous results obtained by other workers using dielectric measurements (Bye and Keve, 1972;et al 1971 ;Jasinski and Stankowska, 1987; Stankowska and Jasinski, 1987).…”

Section: Resultssupporting

confidence: 90%

“…Electrical measurements reported in the literature indicate that LATGS crystals possess an internal bias field that strongly affects the ferroelectric phase transition (rounding effect of the phase transition), (Bye and Keve, 1972;Keve et al, 1971;Jasinki and Stankowska, 1983;Stankowska and Jasinki, 1987;Okaz et al, 1988).…”

Section: Resultsmentioning

confidence: 98%

“…amino propionic acid or L-a alanine CH, CH(NH,) COOH, into the crystal of TGS during its growth creates high internal (Okaz et al, 1988).…”

Section: Resultsmentioning

confidence: 99%

“…The influence of organic admixtures on the electrical properties of TGS crystals has been analysed frequently Stankowska, 1983, 1987; Stankowska and Jasinski, 1987; Okaz, El-Osairy ; Kassem and Hamed, 1988 were found to generate a bias field in the crystal which lowers the permittivity, shifts the Curie point towards higher temperatures , and decreases the electrical conductivity (Okaz et al, 1988). Keve et al (1971) have given a model describing the ~-a alanine molecule as being taken up in the TGS crystal by replacing glycine I, and consequently the crystal is permanently polarized along one direction.…”

Section: Introductionmentioning

confidence: 99%

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Thermal expansion of LATGS crystals

et al. 1990

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The thermal expansion of triglycine sulphate crystals doped with L-a alanine (LATGS) has been studied around the phase transition temperature (30-60°C) using thermomechanical analysis, TMA. With increasing content of admixture, the transition temperature (T,) was shifted towards higher values, while the expansion of the crystals (ALIL,) varied both in the para and ferroelectric phases.The transition width in doped crystals was found to be. broad, and this broadening increased with increasing content of L-a alanine.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 98%

“…amino propionic acid or L-a alanine CH, CH(NH,) COOH, into the crystal of TGS during its growth creates high internal (Okaz et al, 1988).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal expansion of LATGS crystals

et al. 1990

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“…The compounds of the family LiASO 4 (A ¼ Li, Na, K, Rb, Cs) have been intensively investigated in the recent past because of their physical properties such as ionic conductivity, ferroelectricity and ferroelasticity. [1][2][3] Due to the orientational disorder of sulphate groups, these compounds undergo a phase transition at high temperature accompanied by a jump in the electrical conductivity. 4,5 Studies on successive phase transitions in lithium rubidium sulphate (LRS) single crystals have been reported by various authors.…”

Section: Introductionmentioning

confidence: 99%

Electrical and mechanical studies on ferroelectric lithium rubidium sulphate crystals

2018

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Slow evaporation method was used to grow single crystals of lithium rubidium sulphate with high transparency. Single crystal X-ray diffraction analysis shows that at room temperature, the crystal belongs to a monoclinic system with the space group [Formula: see text]/[Formula: see text]. Some physical parameters like plasma energy, Penn gap, Fermi energy and electronic polarizability have been evaluated for the grown crystal. The relation between electronic polarizability and diamagnetic susceptibility for the crystal has been established on the basis of Kirkwood’s semiempirical equation. The ac conductivity and dielectric behavior of the grown crystal were systemically investigated as a function of frequency and temperature. The title compound obeys Jonscher’s power law relations: [Formula: see text], with exponent [Formula: see text]. From the conduction study, it is observed that both small and large polarons take part in conduction process, and at low temperature, both the band and hopping mechanisms are responsible for conduction. From impedance and modulus studies, it is observed that only one conduction relaxation is observed in the crystal at low frequency. The activation energy of the dielectric relaxation (0.41[Formula: see text]eV) and that of the conduction ([Formula: see text][Formula: see text]eV) are in agreement, as a result, there is no difference among the conduction and relaxation species at high temperature. Differential scanning calorimetric analysis of the crystal shows three endothermic peaks at 166[Formula: see text]C, 185[Formula: see text]C, and 202[Formula: see text]C, from which various thermodynamic parameters such as [Formula: see text], [Formula: see text] and [Formula: see text] have been calculated. From Vickers hardness test, we have determined the mechanical strength, and other parameters which include fracture toughness, brittleness index, yield strength, and stiffness constant for the crystal.

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60a-1: 9-16 (Nh2ch2cooh)3·h2so4 [F]

Nakatani

Organic Crystals, Liquid Crystals and Polymers

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The influence of L-α-alanine admixture, rejuvenation process, and electric field on the electrical conductivity of TGS crystals

Cited by 10 publications

References 7 publications

Thermal expansion of LATGS crystals

Thermal expansion of LATGS crystals

Electrical and mechanical studies on ferroelectric lithium rubidium sulphate crystals

60a-1: 9-16 (Nh2ch2cooh)3·h2so4 [F]

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